(2S,4S,4aS,6R,9S,11S,12S,12aS)-2-Bromo-11,12-(carbonyldioxy)-4a,8,13,13-tetramethyl-1-methylene-5-oxo-4,9-bis(triethylsiloxy)-1,2,3,4,4a,5,6,9,10,11,12,12a-dodecahydro-7,11-methanobenzocyclodecen-6-yl acetate

(3aS,5S,8R,9aS,10S,12S,13aR,13bS)-6,9a,14,14-tetramethyl-13-methylene-2,9-dioxo-5,10-bis((triethylsilyl)oxy)-5,8,9,9a,10,11,12,13,13a,13b-decahydro-4H-3a,7-methanobenzo[3,4]cyclodeca[1,2-d][1,3]dioxole-8,12-diyl diacetate